libunwind: Security Advisory - libunwind - CVE-2015-3239

libunwind: Invalid dwarf opcodes can cause references beyond the end of
the array

Off-by-one error in the dwarf_to_unw_regnum function in include/dwarf_i.h
 in libunwind 1.1 allows local users to have unspecified impact via
invalid dwarf opcodes.

(From OE-Core master rev: 9c4e7f5c009b076b0bc638a02fcf3d96c362e7eb)

(From OE-Core rev: 38de3cd2fcc5e2c79dcf1c864c84f8e712111e5d)

Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 30 insertions, 0 deletions

diff --git a/meta/recipes-support/libunwind/libunwind-1.1/0001-Invalid-dwarf-opcodes-can-cause-references-beyond-th.patch b/meta/recipes-support/libunwind/libunwind-1.1/0001-Invalid-dwarf-opcodes-can-cause-references-beyond-th.patch
new file mode 100644
index 0000000000..af972f84e4
--- /dev/null
+++ b/meta/recipes-support/libunwind/libunwind-1.1/0001-Invalid-dwarf-opcodes-can-cause-references-beyond-th.patch
@@ -0,0 +1,29 @@
+From 396b6c7ab737e2bff244d640601c436a26260ca1 Mon Sep 17 00:00:00 2001
+From: Arun Sharma <arun@sharma-home.net>
+Date: Fri, 19 Jun 2015 19:47:22 -0700
+Subject: [PATCH] Invalid dwarf opcodes can cause references beyond the end of
+ the array.
+
+Upstream-Status: backport
+
+Signed-off-by: Li Zhou <li.zhou@windriver.com>
+---
+ include/dwarf_i.h |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/dwarf_i.h b/include/dwarf_i.h
+index 1e6231e..4a02a7d 100644
+--- a/include/dwarf_i.h
++++ b/include/dwarf_i.h
+@@ -20,7 +20,7 @@
+ extern const uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH];
+ /* REG is evaluated multiple times; it better be side-effects free!  */
+ # define dwarf_to_unw_regnum(reg)                                        \
+-  (((reg) <= DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
++  (((reg) < DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
+ #endif
+ 
+ #ifdef UNW_LOCAL_ONLY
+-- 
+1.7.9.5
+
diff --git a/meta/recipes-support/libunwind/libunwind_1.1.bb b/meta/recipes-support/libunwind/libunwind_1.1.bb
index ee6f522d68..8282c1b71a 100644
--- a/meta/recipes-support/libunwind/libunwind_1.1.bb
+++ b/meta/recipes-support/libunwind/libunwind_1.1.bb
@@ -5,6 +5,7 @@ SRC_URI += "\
     file://AArch64-port.patch \
     file://Fix-test-case-link-failure-on-PowerPC-systems-with-Altivec.patch \
     file://Link-libunwind-to-libgcc_s-rather-than-libgcc.patch \
+    file://0001-Invalid-dwarf-opcodes-can-cause-references-beyond-th.patch \
 "
 
 SRC_URI[md5sum] = "fb4ea2f6fbbe45bf032cd36e586883ce"